AN ENGLISH-SPANISH DICTIONARY (GRANADA UNIVERSITY, SPAIN), 14.4
forestall1
(v.) = evitar, prevenir, impedir, frustrar.
Ex: In order to forestall such an event, some libraries in Britain were stung into action by the publication of an Act of Parliament which totally ignored public libraries.
forestall2
(v.) = adelantarse a, precaver, anticiparse a.
Ex: Attempting to forestall problems before they were created was essential to the planning.